"The Eighth Day" presents an expansion of biodiversity beyond wildtype life forms. As a self-contained artificial ecological system it resonates with the words in the title, which add one day to the period of creation of the world as narrated in the Judeo-Christian Scriptures. All of the transgenic creatures in "The Eighth Day" are created through the cloning of a gene that codes for the production of green fluorescent protein (GFP). As a result, all creatures express the gene through bioluminescence visible with the naked eye. The transgenic creatures in "The Eighth Day" are GFP plants, GFP amoeba, GFP fish, and GFP mice.
A biobot is a robot with an active biological element within its body which is responsible for aspects of its behavior. The biobot created for "The Eighth Day" has a colony of GFP amoeba called Dyctiostelium discoideum as its "brain cells". These "brain cells" form a network within a bioreactor that constitutes the "brain structure" of the biobot. When amoebas divide the biobot exhibits dynamic behavior inside the enclosed environment. Changes in the amoebal colony (the "brain cells") of the biobot are monitored by it, and cause it to move throughout the exhibition. The biobot has six legs. When the amoeba move in the direction of a given leg, that leg contracts, causing the biobot to lean forward. Often one leg will contract while another will stretch back to its original position, creating a more complex sequence of movement. Ascending and descending motion becomes a visual sign of amoebal activity. The biobot also functions as the avatar of Web participants inside the environment. Independent of the ascent and descent of the biobot, Web participants are able to control its audiovisual system with a pan-tilt actuator. The autonomous ascent and descent motion provide Web participants with a new perspective of the environment.
The biobot has a biomorphic form and the "amoebal brain" is visible through the transparent bioreactor. In the gallery, visitors are able to see the terrarium with transgenic creatures from outside and inside the dome, as a computer in the gallery gives local visitors an exact sense of what the experience is like on the Internet. By enabling participants to experience the environment inside the dome from the point of view of the biobot, "The Eighth Day" creates a context in which participants can reflect on the meaning of a transgenic ecology from a first-person perspective.
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